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+//Example number 6.2, Page number 116
+
+clc;clear;
+close;
+
+//Variable declaration
+T=300;    //temperature(K)
+n=8.5*10**28;    //density(per m**3)
+rho=1.69*10**-8;   //resistivity(ohm/m**3)
+e=1.6*10**-19;      //charge(c)
+m=9.11*10**-31;      //mass(kg)
+Kb=1.38*10**-23;     //boltzmann constant(J/k)
+//Calculation
+rho=sqrt(3*Kb*m*T)/(n*e**2*rho);     //mean free path(m)
+//Result
+printf("mean free path is %.2e m",rho)
+//answer given in the book is wrong